S
M
T
W
T
F
S
29
35°
30°
30
37°
29°
1
38°
32°
2
41°
32°
3
43°
33°
4
43°
32°
5
42°
31°
6
39°
31°
7
42°
32°
8
43°
30°
9
38°
30°
10
33°
29°
11
36°
30°
12
37°
29°
13
38°
30°
14
40°
27°
15
41°
28°
16
40°
23°
17
35°
22°
18
31°
24°
19
32°
25°
20
32°
28°
21
39°
20°
22
39°
20°
23
35°
18°
24
30°
17°
25
27°
20°
26
29°
27°
27
37°
25°
28
37°
22°
29
36°
18°
30
29°
19°
31
27°
17°
1
28°
22°
2
36°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in St. John's
St. John's's December 2026 forecast shows daily high temperatures ranging from 27° to 43°, with overnight lows between 17° and 33°. The average high for December is 36° with an average low of 26°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in St. John's. See also: January | February | March.
